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Murrr4er [49]
3 years ago
12

Write the blue letters that are inside closed figures. These letters can be arranged into two words that tell the ride that Rach

el rode first when she arrived at the amusement park. What ride did Rachel ride first?
Mathematics
1 answer:
Pepsi [2]3 years ago
3 0
You dont have the blue letters that have closed figures..
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Anita saved $325 to give to her grandchildren at the end of the year . If she has 17 grandchildren and divided the money equally
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D) Round 0.00208815 to 3 significant figures.
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A certain virus infects one in every 400 people. A test used to detect the virus in a person is positive 90% of the time if the
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Answer:Given:

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P(B|A)=9/10

P(B|~A)=1/10

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By the law of total probability,

P(B)=P(B|A)*P(A)+P(B|A)*P(~A)

=(9/10)*(1/400)+(1/10)*(399/400)

=51/500

Note: get used to working in fraction when doing probability.

(a) Find P(A|B):

By Baye's Theorem,

P(A|B)

=P(B|A)*P(A)/P(B)

=(9/10)*(1/400)/(51/500)

=3/136

(b) Find P(~A|~B)

We know that

P(~A)=1-P(A)=399/400

P(~B)=1-P(B)=133/136

P(A∩B)

=P(B|A)*P(A) [def. of cond. prob.]

=9/10*(1/400)

=9/4000

P(A∪B)

=P(A)+P(B)-P(A∩B)

=1/400+51/500-9/4000

=409/4000

P(~A|~B)

=P(~A∩~B)/P(~B)

=P(~A∪B)/P(~B)

=(1-P(A∪B)/(1-P(B)) [ law of complements ]

=(3591/4000) ÷ (449/500)

=3591/3592

The results can be easily verified using a contingency table for a random sample of 4000 persons (assuming outcomes correspond exactly to probability):

===....B...~B...TOT

..A . 9 . . 1 . . 10

.~A .399 .3591 . 3990

Tot .408 .3592 . 4000

So P(A|B)=9/408=3/136

P(~A|~B)=3591/3592

As before.

Step-by-step explanation: its were the answer is

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Write an equation of the line that passes through a pair of points (-5, -2) (3, -1)
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